Rupture of an unruptured intracranial aneurysm (UIA) is the most common cause of subarachnoid haemorrhage (SAH), and at least one in 20–30 adults is estimated to carry an asymptomatic UIA. However, the likelihood and epidemiology of UIA rupture and the associated risk factors are poorly understood. In this Perspectives article, Korja and Kaprio discuss possible misconceptions in the epidemiology of UIAs and SAH, and suggest options to improve the quality of future research.
- Miikka Korja
- Jaakko Kaprio